Update Testing Library

Created by: kentcdodds

Is your proposal related to a problem?

I want to ensure people are set up for success when testing

Describe the solution you'd like

The default template should include the latest version of testing library packages.

Also, the ESLint config should include the testing library ESLint plugins:

• eslint-plugin-testing-library
• eslint-plugin-jest-dom

With that in mind, how do people typically run linting for files not bundled by webpack? Should we include a lint script?

Describe alternatives you've considered

Leaving things as-is and letting users do this themselves.

Additional context

I've noticed people making some common mistakes and want to help them avoid those.